| Justuk.Net Limited | Wholesale & retail | 2004 |
| K & N Investments Limited | Real estate | 2023 |
| K G L Limited | Real estate | 2013 |
| K2AF Trading Limited | Administrative & support | 2011 |
| Kaisha Limited | Other services | 2011 |
| Karahi Junction Hampton Ltd | Hospitality | 2025 |
| Karson Management (UK) Limited | Professional & scientific | 2007 |
| Kevin Hogan Advisory Services Limited | Other services | 2009 |
| Kingsbridge Construction (UK) Limited | Construction | 2008 |
| Kingston Associates Limited | Information & communication | 2008 |
| Kinitoma Limited | Health & social care | 2018 |
| Kjeam Limited | Information & communication | 2012 |
| KM Commodities Limited | Wholesale & retail | 2020 |
| Knight Property Management & Development Ltd | Professional & scientific | 2016 |
| Knowledge to Action (Holdings) Limited | Professional & scientific | 2009 |
| Knowledge to Action Ltd | Education | 2003 |
| Kraft Evolve Ltd | Information & communication | 2022 |
| Krenca Consulting Limited | Administrative & support | 2013 |
| Kunkafa Limited | Information & communication | 2025 |
| KWW Law Limited | Real estate | 2015 |
| L&D Developments Ltd | Real estate | 2025 |
| LA Maison DE Beauté & Esthétique Ltd | Health & social care | 2025 |
| Lamila Trading Ltd | Hospitality | 2024 |
| Landaa Real Estate Ltd | Real estate | 2014 |
| Langton House Residents Limited | Households | 2003 |
| Latoni Properties Limited | Professional & scientific | 2000 |
| LBC2 Learning Ltd | Education | 2024 |
| LE Davis Coaching Limited | Professional & scientific | 2013 |
| Learn to Trade Limited | Administrative & support | 2011 |
| Leila Group Ltd | Construction | 2019 |
| Leimon Ltd | Professional & scientific | 2021 |
| Leith Partners Limited | Professional & scientific | 2010 |
| Leonidas Limited | Professional & scientific | 2000 |
| LEVEL3HOMESURVEYS Limited | Professional & scientific | 2026 |
| Leverage Your Worth Ltd | Administrative & support | 2024 |
| Licemp Consulting Ltd | Professional & scientific | 2025 |
| Lightfever Limited | Arts & recreation | 2022 |
| Liguori Limited | Manufacturing | 2012 |
| Limitless Bidco Limited | Other services | 2026 |
| Limitless Midco Limited | Other services | 2026 |
| Lines of Communication Limited | Information & communication | 2013 |
| Lionel Curie Limited | Health & social care | 2005 |
| Liongate Properties Limited | Hospitality | 2021 |
| Lipmann Walton & Company Limited | Wholesale & retail | 1953 |
| Lipmann Walton AL Trading Ltd | Wholesale & retail | 2021 |
| Little Bear's Day-Care Limited | Health & social care | 2015 |
| Little Biscuits Ltd | Professional & scientific | 2024 |
| Little Matey Productions Limited | Administrative & support | 2010 |
| Liyana (UK) Limited | Real estate | 2010 |
| LJO Homes Ltd | Real estate | 2024 |
| Lloyds Residential Teddington Limited | Real estate | 2015 |
| Loft Connected Consulting Limited | Professional & scientific | 2025 |
| London and Surrey Cars Ltd | Wholesale & retail | 2005 |
| LRC Interiors Ltd | Professional & scientific | 2013 |
| Lucas Wealth Management Limited | Financial services | 2017 |
| Luneia Ltd | Wholesale & retail | 2019 |
| Luso Caledonian Group Limited | Professional & scientific | 1984 |
| Luso Caledonian Limited | Professional & scientific | 1979 |
| Luxe Technologies Ltd | Professional & scientific | 2018 |
| M D Eastwood Limited | Professional & scientific | 2013 |
| Macarong Hampton Limited | Hospitality | 2024 |
| Madcat Design Limited | Administrative & support | 2005 |
| Madison HH Limited | Administrative & support | 2016 |
| Magenta Rock Ltd | Professional & scientific | 2020 |
| Maiia Williams Architects Ltd | Professional & scientific | 2024 |
| Make Yourself Limited | Education | 2008 |
| MAN UK Properties Ltd | Construction | 2013 |
| Marhall Three Limited | Real estate | 2005 |
| Mark Jeffery Orthopaedics Limited | Health & social care | 2013 |
| Marks Hills & Co Limited | Financial services | 2009 |
| Marncrest Court Freehold Limited | Households | 1998 |
| Marshmills Limited | Extraterritorial | 2008 |
| Martins Design Services Limited | Professional & scientific | 2023 |
| Maypole Production Ltd | Professional & scientific | 2023 |
| Mcewen Pottie Ltd | Professional & scientific | 2025 |
| Mcintyre Engineering Services Limited | Professional & scientific | 1990 |
| Meilustre Ltd | Health & social care | 2024 |
| Meldstone Limited | Real estate | 2020 |
| Metropolis Builders Ltd | Extraterritorial | 2007 |
| Metropolitan Police (Imber Court) Sports Club | Arts & recreation | 2014 |
| MFB 2026 Limited | Construction | 2026 |
| Michael Jane Projects Ltd | Construction | 2024 |
| Midopen Limited | Households | 1982 |
| Miles and Bird Ltd | Real estate | 2015 |
| Milestone Productions Ltd | Information & communication | 2022 |
| Millcourt Management Company (Yeovil) Limited | Households | 2012 |
| Minerva SC Solutions Limited | Professional & scientific | 2017 |
| Minerva Smart Places Limited | Financial services | 2020 |
| Mintberry Ltd | Wholesale & retail | 2025 |
| Misabanel Ltd | Hospitality | 2025 |
| MJA Architecture Ltd | Construction | 2023 |
| MM Morley's Chicken Ltd | Hospitality | 2017 |
| Mogford Albion Limited | Financial services | 2009 |
| Mole Brown Ltd | Professional & scientific | 2010 |
| Molehill Development Limited | Real estate | 2007 |
| Molesey Boat Club (Trading) Ltd | Arts & recreation | 2022 |
| Molesey Boat Club Limited(The) | Arts & recreation | 1953 |
| Molesey Global Network Ltd | Information & communication | 2026 |
| Molesey Services Ltd | Professional & scientific | 2009 |
| Montreux Group Overseas Limited | Financial services | 2017 |